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环渤海湾地区寒武系发育陆源碎屑与海相碳酸盐的混合沉积。综合前人研究成果,结合大量的区域地质资料、野外露头资料和钻井资料等,对环渤海湾地区寒武系混合沉积进行了详细的研究。研究结果表明研究区混合沉积特征宏观上表现为由陆源碎屑与碳酸盐交互沉积、陆源碎屑与混积物交互沉积、碳酸盐与混积物交互沉积和混积物本身的交互沉积构成的混积层系,微观上表现为同一岩层内由陆源碎屑组分与碳酸盐组分混合沉积所形成混积岩;混合沉积类型有渐变式混合沉积、突变式混合沉积和复合式混合沉积Ⅰ,但是各种类型的混合沉积常相互叠加,频繁交替,形成类型复杂的混合沉积复合体;混合沉积环境为古陆边缘和陆表海,发育混积潮坪相、混积局限台地相和混积开阔台地相,微相类型有混积泥坪、混积灰坪、混积云坪、混积泻湖、混积浅滩和混积滩间等。最后结合混合沉积的成因、沉积机理、产出部位及沉积环境等因素,以沉积学原理为指导,建立了环渤海湾地区寒武系的混合沉积模式,进而对混合沉积的控制因素进行了讨论。
Mixed deposition of terrigenous clastic and marine carbonate in the Cambrian of the Bohai Gulf. Based on the previous research results, combined with a large number of regional geological data, outcrop data and drilling data, the Cambrian mixed deposition in the Bohai Bay region has been studied in detail. The results show that the mixed sedimentary features of the study area are macroscopically characterized by the interaction between terrigenous clastic and carbonate, the mutual deposition of terrigenous clastic and sediment, the interaction between carbonate and sediment and the sediment deposition , Which is composed of mixed sediments of terrestrial detrital components and carbonate components within the same rock formation. The mixed sedimentary types include graded mixing sedimentation, abrupt mixed deposition and composite However, all kinds of mixed sediments are often superimposed on each other and alternated frequently to form complex mixed sedimentary complexes. The mixed sedimentary environments are paleo-continental margins and land surface sea, with mixed tidal flat facies, confined confined facies and Mixed alluvial and open platform facies, microfacies are mixed with mud puddles, mixed with ash Ping, mixed plot Yunping, mixed lagoon, alluvial and alluvial mixed beach and so on. Finally, according to the causes of sedimentation, deposition mechanism, production site and sedimentary environment and so on, based on the principles of sedimentology, the mixed sedimentary model of Cambrian in the Bohai Bay region is established, and the controlling factors of mixed deposition are discussed. .